New York City based marketing agency Cornerstone is broadening its appeal via a new partnership with New York production group Three/21 Films.

The alliance, which was announced by Cornerstone co-presidents Rob Stone and Jon Cohen, will result in a new division for the company named after Three/21.

The partnership is the latest achievement for Three/21, a company known for producing innovative feature films, music videos, documentaries and short films for various entertainers such as Jay-Z (Blue Magic trailer), Snoop Dog (“Neva Have to Worry” video), The Roots (“Get Busy” video) and others.

“After meeting with the heads of Cornerstone we knew that they get itthey are not just influencing culture, they are helping to create it,” Three/21’s Steve Carless told AllHipHop.com in a statement. “This partnership gives us a great opportunity to maintain our aesthetic while doing work for multiple brand clients.”

For Cornerstones Rob Stone, working with Three/21 offers a chance to help the company “raise the bar on our creative output.”

Cornerstone specializes in brand consulting and strategizing, radio promotion, product seeding, event marketing and production, music marketing, public relations and brand building.

“As the challenges for our clients intensify, we continue to push the boundaries of our creativity,” Stone said.

A full-service independent marketing firm that works with emerging and established brands, Cornerstone is noted for representing Fortune 500 clients with an emphasis on consumer products and services and entertainment industries.